CN110066914A - A method of recycling metallic iron from blast furnace dust - Google Patents
A method of recycling metallic iron from blast furnace dust Download PDFInfo
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- CN110066914A CN110066914A CN201910490956.7A CN201910490956A CN110066914A CN 110066914 A CN110066914 A CN 110066914A CN 201910490956 A CN201910490956 A CN 201910490956A CN 110066914 A CN110066914 A CN 110066914A
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- blast furnace
- furnace dust
- metallic iron
- roasting
- iron
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/001—Dry processes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/02—Working-up flue dust
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
A method of it recycling metallic iron from blast furnace dust, is related to metallurgical solid waste resource recovery using field, reduction roasting-gravity treatment-magnetic separation way of recycling is used to blast furnace dust.Wherein, reduction roasting can improve the granularity of blast furnace dust, avoid as blast furnace dust granularity it is too low caused by the low problem of beneficiating efficiency.Meanwhile obtained roasting slag charge passes through gravity treatment, preferential partition size is larger, the higher heavy burder of purity, to reduce magnetic separation inlet amount, strengthens to the magnetic separation separating effect gently expected, reaches optimal recovery efficiency.This method is easy to operate, not high to equipment requirement, solves in the prior art that the rate of recovery is not high, recycling the problem of product purity is low, practical value with higher.
Description
Technical field
The present invention relates to metallurgical solid waste resource recovery to utilize field, in particular to one kind from blast furnace dust
The method for recycling metallic iron.
Background technique
Blast furnace dust is one of the conventional solid waste that iron and steel smelting generates, main component are as follows: fuel dust (carbon
Powder), low boiling point nonferrous metal oxides and iron containing compounds etc..With the rapid development of last decade national economy, steel yield
It rises rapidly, this is but also explosive growth occurs in blast furnace dust discharge amount.According to the relevant information, the year two thousand twenty, China is waited for
The blast furnace dust of processing is up to 100,000,000 tons or so.If still using the extensive style processing mode of air storage, blast furnace gas
Heavy metal element (zinc, lead and cadmium etc.) in ash can bring and seriously threaten to the local ecosystem and drinking water safety.It is another
Aspect contains a large amount of ferro element (15% ~ 40%) in blast furnace dust, mainly with FeO, Fe2O3, Fe3O4Equal iron oxides
Form exist, have weak magnetic or magnetism.Although it is higher that this makes magnetic separation recovery become feasibility in theory, it is also faced with magnetic
The problems such as property is too low, dirt band amount is excessive, separative efficiency is poor.Therefore, developing a kind of can both remove the toxic huge sum of money such as zinc and lead
Belong to element, and the method for energy high efficiente callback metallic iron, can not only alleviate the pressure from ecological environmental protection, moreover it is possible to meet money
The demand that source recycles creates considerable economic benefit.
Summary of the invention
The method that the purpose of the present invention is to provide a kind of to recycle metallic iron from blast furnace dust, it is easy to operate, it is right
Equipment requirement is not high, has recovery efficiency high, recycles the high advantage of product quality.
The embodiment of the present invention is achieved in that
A method of recycling metallic iron from blast furnace dust comprising:
Blast furnace dust is mixed with coke, obtains mixture；
Reduction roasting is carried out to mixture, obtains roasting slag charge；
Roasting slag charge is crushed, the biggish heavy burder of density and the lesser light material of density are obtained after gravity treatment；
Light material obtains iron powder product and waste residue by magnetic separation.
The beneficial effect of the embodiment of the present invention is:
The method that the embodiment of the invention provides a kind of to recycle metallic iron from blast furnace dust, to blast furnace dust using also
Former roasting-gravity treatment-magnetic separation way of recycling.Wherein, reduction roasting can improve the granularity of blast furnace dust, avoid due to
The low problem of beneficiating efficiency caused by blast furnace dust granularity is too low.Meanwhile obtained roasting slag charge passes through gravity treatment, it is preferential to separate
Granularity is larger, the higher heavy burder of purity, to reduce magnetic separation inlet amount, strengthens to the magnetic separation separating effect gently expected, reaches best
Recovery efficiency.This method is easy to operate, not high to equipment requirement, solves in the prior art that the rate of recovery is not high, recycles product
The low problem of purity, practical value with higher.
Specific embodiment
It in order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below will be in the embodiment of the present invention
Technical solution be clearly and completely described.The person that is not specified actual conditions in embodiment, according to normal conditions or manufacturer builds
The condition of view carries out.Reagents or instruments used without specified manufacturer is the conventional production that can be obtained by commercially available purchase
Product.
A kind of method that metallic iron is recycled from blast furnace dust of the embodiment of the present invention is specifically described below.
The method that the embodiment of the invention provides a kind of to recycle metallic iron from blast furnace dust comprising:
A method of recycling metallic iron from blast furnace dust comprising:
S1. blast furnace dust is mixed with coke, obtains mixture；Reduction roasting is carried out to mixture, obtains roasting slag charge.
Blast furnace dust is one of the conventional solid waste that iron and steel smelting generates, and granularity is extremely low, only 25 microns of left sides
It is right.Too low material size, so that conventional beneficiation method (flotation, gravity treatment and selection by winnowing etc.) is difficult to form effective sorting row
To cause target mineral and tailing extent of mismatch high.Meanwhile the beneficiating methods such as flotation often relate to the transhipment of medicament, store and make
Use problem.This means that concentration effect and economic cost that blast furnace dust directly uses beneficiating method to recycle all are difficult to make us full
Meaning.
Based on this, it is mixed with coke first when handling blast furnace dust, passes through reduction roasting by the present invention
Mode, on the one hand the iron oxide in blast furnace dust is restored, improves the content of iron, on the other hand also has both the work of granulation
With, by the dust that average particle size is only 25 microns improve to be more favorable for processing granularity.Simultaneously, in roasting process
In, moreover it is possible to by the low-melting toxic heavy metal such as zinc by high temperature reduction, gaseous state is formed, achievees the purpose that removal of impurities.
Further, when carrying out mixing, the mass ratio of blast furnace dust and coke is 2 ~ 5:1, preferably 3:1.According to
When aforementioned proportion carries out ingredient, the effect of reduction is preferable, conducive to the content for improving iron.Meanwhile coke selects calorific value to be greater than 4000
The raw material of kcal/kg, to reach preferable reduction effect.
The process of reduction roasting can carry out in rotary kiln, and the temperature of reduction roasting is 1000 ~ 1100 DEG C, the time 1
~3 h.After the completion of roasting, by the cold extraction of mixture clear water after reduction roasting, roasting slag charge is obtained.By the quenching for roasting slag charge
Fragmentation achievees the purpose that tentatively to crush, and obtains the granularity for being suitble to subsequent processing, even if also the granularity of fired slags material is 0.075 ~ 50
mm。
A kind of method recycling metallic iron from blast furnace dust provided by the embodiment of the present invention, further includes:
S3. roasting slag charge is crushed, the biggish heavy burder of density and the lesser light material of density is obtained after gravity treatment.
The broken of roasting slag charge can be carried out using hydraulic jaw crusher and unit for inertial conic crusher, roasted after crushing
The granularity of slag charge need to reach 8 mm hereinafter, namely roasting the granularity of slag charge for 0.075 ~ 8 mm, to meet needed for following process
Feed size.
To broken roasting slag charge carry out gravity treatment, can be pre-separated out roasting slag charge in granularity it is larger, purity is higher
Iron block, need to enter the inlet amount of subsequent magnetic separation process to reduce, improve the effect of magnetic separation.
It is possible to further which broken roasting slag charge and magnetite powder hybrid modulation are carried out at slurry, then to slurry
Gravity treatment.Preferably, for the granularity of magnetite powder less than 0.074 mm, magnetism is weak magnetic, and magnetic material content is 92 wt% ~ 95
wt%.Magnetite powder can come into full contact with roasting slag charge, and there are certain magnetic kind magnetizations, can slightly improve fired slags
The magnetism of material.Simultaneously as particle size differences, magnetite powder can be coated on the surface for the heavy burder that gravity treatment goes out, subsequently through by heavy burder
The Separation by vibration in reciprocating sieve, and iron block product can be obtained after screening of spraying water, and recycle to magnetite powder, realize that it is followed
Ring utilizes.Preferably, the concentration of slurry is 120 ~ 150 g/L.In above-mentioned concentration range, the mixed of slag charge and magnetite powder is roasted
Conjunction effect is preferable, is more favorable for the interaction of the two.
Further, carrying out gravity treatment to slurry can be carried out using dense-medium shallow-tank separator, dense-medium shallow-tank separator bottom
Portion's jetsam, i.e. heavy burder are discharged from horizontal direction by scrapper conveyor, enter directly into reciprocating sieve, and water spray screening removing magnetic iron ore is added
Powder obtains iron block product, and floating material, i.e., light material carry out magnetic separation process with water flow from vertical direction discharge.
A kind of method recycling metallic iron from blast furnace dust provided by the embodiment of the present invention, further includes:
S4. light material obtains iron powder product and waste residue by magnetic separation.
The magnetic field strength for carrying out magnetic separation to light material is 0.2 ~ 0.5 T.Under above-mentioned magnetic field strength, iron powder product and waste residue
Separating effect is more preferable, and the residual iron in waste residue is less, and the rate of recovery of iron is higher.Further, isolated iron powder product and
Waste residue can pack storage sale after filter press is dehydrated.
Feature and performance of the invention are described in further detail with reference to embodiments.
Embodiment 1
A kind of method that metallic iron is recycled from blast furnace dust is present embodiments provided, the specific steps are that:
S1. blast furnace dust and coke are delivered to mixing funnel with the mass ratio of 3:1, by 5 ~ 8 stirring operations, made watt
This ash is sufficiently mixed with coke blacking, obtains mixture.
S2. mixture is sent into rotary kiln by belt feeder, successively into baking zone, heating zone and smelting zone excessively.Roasting
Burn temperature control at 1100 DEG C, 3 h of calcining time.In roasting process, the low-melting toxic heavy metal such as zinc is by high temperature reduction, shape
It is detached from from solid material at gaseous metal, and is discharged as the air-flow that air blower generates is exported from baking zone；Into the cigarette of profession
Flash Gas Compression Skid System carries out desulfurization, dezincification processing.Iron content molten slurry is exported from smelting zone, is called in the cold extraction processing of clear water reserviors rapidly, is obtained
Granularity is the roasting slag charge of 0.075 ~ 50mm.
S3. roasting slag charge is transported between selecting iron car, is sequentially sent to hydraulic jaw crusher and unit for inertial conic crusher；
Broken material is crushed again by 8 mm sieve pore sieve classifications, on-the-sieve material hydraulic return jaw crusher, and undersize material enters
Gravity treatment process.
S4. broken roasting slag charge and magnetite powder are sent into mixing tank stirring, sized mixing, obtaining concentration is 120 g/L
Slurry.
S5. above-mentioned slurry is squeezed into dense-medium shallow-tank separator and carries out gravity treatment, the weight of dense-medium shallow-tank separator bottom by Pulp pump
Material is discharged from horizontal direction by scrapper conveyor, into circle reciprocating sieve, is added water spray further screening removing magnetite powder, is obtained iron block
Product；Lower magnetic iron ore slurry inflow mixing tank is sieved to recycle.
S6. the light material that dense-medium shallow-tank separator floats is discharged with water flow from vertical direction, obtains iron through magnetic pulley magnetic separation recovery
Powder product and waste residue, magnetic field strength are 0.5 T.
S7. iron powder product and waste residue are dehydrated through filter press respectively, pack sale.
Through detecting, the ingredient comparison of raw material and each product is as shown in table 1.
The ingredient of 1. raw material of table and each product compares (unit: %)
| Zinc | Iron | Carbon | Water | Other | |
| Blast furnace dust raw material | 3.34 | 33.43 | 51.23 | 1.53 | 10.47 |
| Iron block product | 0.56 | 92.34 | 1.86 | 5.06 | 0.18 |
| Iron powder product | 0.98 | 73.89 | 8.13 | 15.67 | 1.33 |
| Residue | 0.95 | 22.45 | 58.27 | 16.12 | 2.21 |
As can be seen from Table 1, the iron block of the method for recycling metallic iron used by the present embodiment from blast furnace dust, recycling produces
The iron-content of product and iron powder product respectively reaches 92.34% and 73.89%, all has higher quality, and economic value is obvious.
Embodiment 2
A kind of method that metallic iron is recycled from blast furnace dust is present embodiments provided, the specific steps are that:
S1. blast furnace dust and coke are delivered to mixing funnel with the mass ratio of 4:1, by 5 ~ 8 stirring operations, made watt
This ash is sufficiently mixed with coke blacking, obtains mixture.
S2. mixture is sent into rotary kiln by belt feeder, successively into baking zone, heating zone and smelting zone excessively.Roasting
Burn temperature control at 1000 DEG C, 2 h of calcining time.In roasting process, the low-melting toxic heavy metal such as zinc is by high temperature reduction, shape
It is detached from from solid material at gaseous metal, and is discharged as the air-flow that air blower generates is exported from baking zone；Into the cigarette of profession
Flash Gas Compression Skid System carries out desulfurization, dezincification processing.Iron content molten slurry is exported from smelting zone, is called in the cold extraction processing of clear water reserviors rapidly, is obtained
Granularity is the roasting slag charge of 0.075 ~ 50mm.
S3. roasting slag charge is transported between selecting iron car, is sequentially sent to hydraulic jaw crusher and unit for inertial conic crusher；
Broken material is crushed again by 8 mm sieve pore sieve classifications, on-the-sieve material hydraulic return jaw crusher, and undersize material enters
Gravity treatment process.
S4. broken roasting slag charge and magnetite powder are sent into mixing tank stirring, sized mixing, obtaining concentration is 150 g/L
Slurry.
S5. above-mentioned slurry is squeezed into dense-medium shallow-tank separator and carries out gravity treatment, the weight of dense-medium shallow-tank separator bottom by Pulp pump
Material is discharged from horizontal direction by scrapper conveyor, into circle reciprocating sieve, is added water spray further screening removing magnetite powder, is obtained iron block
Product；Lower magnetic iron ore slurry inflow mixing tank is sieved to recycle.
S6. the light material that dense-medium shallow-tank separator floats is discharged with water flow from vertical direction, obtains iron through magnetic pulley magnetic separation recovery
Powder product and waste residue, magnetic field strength are 0.3 T.
S7. iron powder product and waste residue are dehydrated through filter press respectively, pack sale.
Through detecting, the ingredient comparison of raw material and each product is as shown in table 2.
The ingredient of 2. raw material of table and each product compares (unit: %)
| Zinc | Iron | Carbon | Water | Other | |
| Blast furnace dust raw material | 3.34 | 33.43 | 51.23 | 1.53 | 10.47 |
| Iron block product | 0.51 | 93.15 | 1.94 | 4.06 | 0.34 |
| Iron powder product | 0.86 | 75.14 | 7.93 | 14.51 | 1.56 |
| Residue | 0.93 | 20.15 | 59.85 | 16.6 | 2.47 |
As can be seen from Table 2, the iron block of the method for recycling metallic iron used by the present embodiment from blast furnace dust, recycling produces
The iron-content of product and iron powder product respectively reaches 93.15% and 75.14%, all has higher quality, and economic value is obvious.
In conclusion the method that the embodiment of the invention provides a kind of to recycle metallic iron from blast furnace dust, to height
Furnace gas ash uses reduction roasting-gravity treatment-magnetic separation way of recycling.Wherein, reduction roasting can be by the granularity of blast furnace dust
Improve, avoid as blast furnace dust granularity it is too low caused by the low problem of beneficiating efficiency.Meanwhile obtained roasting slag charge warp
Gravity treatment is crossed, preferential partition size is larger, the higher heavy burder of purity, to reduce magnetic separation inlet amount, strengthens to the magnetic separation gently expected point
From effect, reach optimal recovery efficiency.This method is easy to operate, not high to equipment requirement, solves and recycles in the prior art
Rate is not high, recycles the problem of product purity is low, practical value with higher.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of method for recycling metallic iron from blast furnace dust characterized by comprising
The blast furnace dust is mixed with coke, obtains mixture；
Reduction roasting is carried out to the mixture, obtains roasting slag charge；
The roasting slag charge is crushed, the biggish heavy burder of density and the lesser light material of density are obtained after gravity treatment；
The light material obtains iron powder product and waste residue by magnetic separation.
2. the method according to claim 1 for recycling metallic iron from blast furnace dust, which is characterized in that the high tile
The mass ratio of this ash and the coke is 2 ~ 5:1；Preferably, the calorific value of the coke is greater than 4000 kcal/kg.
3. the method according to claim 1 for recycling metallic iron from blast furnace dust, which is characterized in that the mixing
The temperature that material carries out reduction roasting is 1000 ~ 1100 DEG C, and the time is 1 ~ 3 h.
4. the method according to claim 1 for recycling metallic iron from blast furnace dust, which is characterized in that by reduction roasting
The cold extraction of mixture clear water afterwards, obtains the roasting slag charge.
5. the method according to claim 4 for recycling metallic iron from blast furnace dust, which is characterized in that the fired slags
The granularity of material is 0.075 ~ 50 mm.
6. the method according to claim 1 for recycling metallic iron from blast furnace dust, which is characterized in that by the roasting
It is 0.075 ~ 8 mm that slag charge, which is crushed to granularity,.
7. the method according to claim 1 for recycling metallic iron from blast furnace dust, which is characterized in that will be broken
The roasting slag charge and magnetite powder hybrid modulation carry out gravity treatment at slurry, then to the slurry；Preferably, the slurry is dense
Degree is 120 ~ 150 g/L.
8. the method according to claim 7 for recycling metallic iron from blast furnace dust, which is characterized in that the magnetic iron ore
For the granularity of powder less than 0.074 mm, magnetism is weak magnetic, and magnetic material content is the wt% of 92 wt% ~ 95.
9. the method according to claim 8 for recycling metallic iron from blast furnace dust, which is characterized in that the heavy burder exists
The magnetite powder is separated in reciprocating sieve, obtains iron block product.
10. the method according to claim 1 for recycling metallic iron from blast furnace dust, which is characterized in that described light
The magnetic field strength that material carries out magnetic separation is 0.2 ~ 0.5 T.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113198607A (en) * | 2021-04-28 | 2021-08-03 | 河南省煜晟镍业有限责任公司 | Low nickel matte comprehensive treatment method |
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Application publication date: 20190730 |